陨石中铀、钍和铅的细粒度分布的 SIMS 研究

IF 2.5 4区 化学 Q3 CHEMISTRY, ANALYTICAL
Keewook Yi, Yuri Amelin
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引用次数: 0

摘要

我们报告开发了一个测量铀、钍和铅(包括所有天然铅同位素)浓度的程序,以确定这些元素在陨石矿物中的分布,并正确解释陨石的铅同位素年龄。这些浓度是在 KBSI SHRIMP IIe 上使用离散模式二次电子倍增器通过峰跃法测量的。浓度是相对于 BCR-2G 玻璃计算的,并通过分析作为二级参考材料的 NIST 玻璃 SRM-615 和 SRM-617 进行监测。使用约 180 μm2 的光斑尺寸、10.6 nA 的主 O2- 束电流和每秒 0.015 计数的放大器暗噪,U(500 秒积分)的检测限约为十亿分之 0.2,Pb 约为十亿分之 0.6(每个主要同位素的 100 秒积分),Th 约为十亿分之 1.2(100 秒积分)。对 NIST 玻璃的分析证实,测得的铀和钍浓度与其认证值一致,而铅浓度则低了约四倍,这很可能是由于主要参考材料和次要参考材料之间的成分不匹配造成的。所达到的灵敏度和浓度精度水平(约为 20-30%)足以测量软玉体、非软玉体及其成分中成岩矿物和附属矿物的铀、钍和铅分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SIMS study of fine-scale distribution of U, Th and Pb in meteorites
We report developing a procedure for measuring concentrations of U, Th and Pb (including all natural Pb isotopes) to establish the distribution of these elements in meteorite minerals and correctly interpret Pb-isotopic ages of meteorites. The concentrations were measured on KBSI SHRIMP IIe by peak jumping using a discrete-dynode secondary electron multiplier. The concentrations were calculated relative to BCR-2G glass and monitored by analysis of the NIST glasses SRM-615 and SRM-617 as secondary reference materials. The detection limits using the spot sizes of ca. 180 μm2, primary O2− beam current of 10.6 nA, and with amplifier dark noise of 0.015 counts per second are ~ 0.2 parts per billion (ppb) for U (500 s integration), ~ 0.6 ppb for Pb (100 s integration for each of the major isotopes), and ~ 1.2 ppb for Th (100 s integration). Analyses of the NIST glasses confirm that the measured concentrations of U and Th are consistent with their certified values, while the Pb concentrations are about four times too low, most likely due to the compositional mismatch between the primary and secondary reference materials. The achieved level of sensitivity and concentration precision (~ 20–30%) is adequate for measuring U, Th and Pb distributions in both rock-forming and accessory minerals in chondrites, achondrites, and their components.
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来源期刊
Journal of Analytical Science and Technology
Journal of Analytical Science and Technology Environmental Science-General Environmental Science
CiteScore
4.00
自引率
4.20%
发文量
39
审稿时长
13 weeks
期刊介绍: The Journal of Analytical Science and Technology (JAST) is a fully open access peer-reviewed scientific journal published under the brand SpringerOpen. JAST was launched by Korea Basic Science Institute in 2010. JAST publishes original research and review articles on all aspects of analytical principles, techniques, methods, procedures, and equipment. JAST’s vision is to be an internationally influential and widely read analytical science journal. Our mission is to inform and stimulate researchers to make significant professional achievements in science. We aim to provide scientists, researchers, and students worldwide with unlimited access to the latest advances of the analytical sciences.
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